Tomato paste by John Spottiswood.

tomato paste = (in Britain) tomato puree Substitutes: tomato sauce (Use twice as much, but compensate by reducing another liquid in recipe. Tomato sauce has salt, pepper, and other seasonings added; tomato paste includes only salt.) OR tomato puree (Use twice as much, but compensate by reducing another liquid in recipe. Tomato puree is unseasoned, while tomato paste has salt added.)